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new file 100644
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/* $Id$ */
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/** @file ai_sign.hpp Everything to query and build signs. */
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#ifndef AI_SIGN_HPP
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#define AI_SIGN_HPP
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#include "ai_object.hpp"
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#include "ai_error.hpp"
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#include "ai_company.hpp"
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/**
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* Class that handles all sign related functions.
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*/
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class AISign : public AIObject {
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public:
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static const char *GetClassName() { return "AISign"; }
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/**
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* All sign related error messages.
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*/
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enum ErrorMessages {
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/** Base for sign building related errors */
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ERR_SIGN_BASE = AIError::ERR_CAT_SIGN << AIError::ERR_CAT_BIT_SIZE,
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/** Too many signs have been placed */
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ERR_SIGN_TOO_MANY_SIGNS, // [STR_2808_TOO_MANY_SIGNS]
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};
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/**
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* Gets the maximum sign index; there are no valid signs with a higher index.
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* @return The maximum sign index.
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* @post Return value is always non-negative.
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*/
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static SignID GetMaxSignID();
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/**
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* Checks whether the given sign index is valid.
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* @param sign_id The index to check.
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* @return True if and only if the sign is valid.
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*/
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static bool IsValidSign(SignID sign_id);
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/**
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* Set the name of a sign.
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* @param sign_id The sign to set the name for.
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* @param name The name for the sign.
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* @pre IsValidSign(sign_id).
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* @pre 'name' must have at least one character.
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* @pre 'name' must have at most 30 characters.
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* @exception AIError::ERR_NAME_IS_NOT_UNIQUE
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* @return True if and only if the name was changed.
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*/
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static bool SetName(SignID sign_id, const char *name);
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/**
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* Get the name of the sign.
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* @param sign_id The sign to get the name of.
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* @pre IsValidSign(sign_id).
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* @return The name of the sign.
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*/
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static const char *GetName(SignID sign_id);
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/**
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* Gets the location of the sign.
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* @param sign_id The sign to get the location of.
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* @pre IsValidSign(sign_id).
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* @return The location of the sign.
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*/
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static TileIndex GetLocation(SignID sign_id);
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/**
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* Builds a sign on the map.
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* @param location The place to build the sign.
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* @param text The text to place on the sign.
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* @pre AIMap::IsValidTile(location).
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* @pre 'text' must have at least one character.
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* @pre 'text' must have at most 30 characters.
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* @exception AISign::ERR_SIGN_TOO_MANY_SIGNS
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* @return The SignID of the build sign (use IsValidSign() to check for validity).
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* In test-mode it returns 0 if successful, or any other value to indicate
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* failure.
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*/
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static SignID BuildSign(TileIndex location, const char *text);
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/**
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* Removes a sign from the map.
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* @param sign_id The sign to remove.
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* @pre IsValidSign(sign_id).
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* @return True if and only if the sign has been removed.
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*/
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static bool RemoveSign(SignID sign_id);
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};
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#endif /* AI_SIGN_HPP */
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